Senior Applied Scientist (AI)

Location: Remote within the United States; employees may live in any of the 50 states, with limited exceptions.

Salary: $160,900–$257,100 annually in specified states, or $152,900–$244,300 annually in another specified group of states. Equity awards are also available.

Company

hirify.global is a large U.S. real estate platform building technology for buying, selling, financing, and renting homes.

What you will do

• Own end-to-end LLM post-training pipelines, including SFT, DPO, and RFT/GRPO, on GPU infrastructure.
• Build and train multi-category preference-based reward models that produce scalar signals.
• Design on-policy and online evaluation for live agent trajectories using LLM-as-a-Judge frameworks.
• Convert offline evaluation rubrics into generalizable reward functions for production traces.
• Drive ambiguous technical initiatives across product, engineering, science, platform, and data teams.
• Provide technical leadership and mentorship while bringing advanced AI research into production.

Requirements

• Master’s degree or higher in Computer Science or a related field.
• Hands-on experience with LLM post-training and reinforcement learning fine-tuning, including SFT, DPO, and RFT/GRPO.
• Experience running end-to-end training runs on GPU infrastructure.
• Strong knowledge of generative AI, foundation models, transformers, reinforcement learning, and preference learning.
• Strong programming skills in Python and experience with PyTorch or TensorFlow.
• Ability to independently solve ambiguous problems and provide technical leadership to scientists and machine learning engineers.

Nice to have

• PhD in Computer Science, Machine Learning, or a related field.
• Experience evaluating agentic AI through multi-turn trace analysis, LLM-as-a-Judge, offline evaluations, and online monitoring.
• Published research in post-training, RLHF/RLAIF, preference learning, or reward modeling.
• Experience with GPU training platforms such as Databricks or Fireworks.

Culture & Benefits

• Distributed work through Cloud HQ, with flexibility to work from a productive location within the permitted U.S. locations.
• Work on agentic AI technologies supporting search, personalized guidance, offer strategy, and financing.
• Opportunity to contribute to systems operating at hundreds of millions of requests per day.
• Equity awards are available in addition to base salary.
• Inclusive workplace committed to equal employment opportunity and employee growth.